Hatra is a large fortified city which has stood under the influence of the Parthian Empire; it was once the capital of the first Arab Kingdom. Its high, thick walls reinforced by towers allowed it to withstand Roman invasions in 116 and 198 A.D. The city’s ruins, in particular the temples that blend Hellenistic and Roman architecture with Eastern decorative features, stand as evidence to the greatness of the site’s civilization. --WHMNet paraphrase from the description at WHC Site, where additional information is available.

Hatra is an ancient ruined city in the Ninawa Governorate and al-Jazira region of Iraq. It is today called al-Hadr, and it stands in the ancient Persian province of Khvarvaran. The city lies 290 km (180 miles) northwest of Baghdad and 110 km (68 miles) southwest of Mosul. --Wikipedia. Text is available under the Creative Commons Attribution-ShareAlike License.